牛血清白蛋白对Na_xCo_2O_4化合物形成的影响

Influence of Bovine Serum Albumin on the Formation of Na_xCo_2O_4 Compounds

探索了一种用于制备纳米片状Na_xCo_2O_4化合物的新的化学合成法—蛋白质吸附法,研究了牛血清白蛋白(BSA)对Na_xCo_2O_4化合物形成的影响.结果表明,BSA在一定浓度范围内可以明显降低胶态前驱体的平均粒子尺寸,BSA浓度的增大抑制了γ-Na_(0.71)Co_(0.96)O_2晶体的形成,并对煅烧产物的相组成和形态产生了明显的影响.800℃煅烧得到超薄片状γ-Na_(0.71)Co_(0.96)O_2晶体,厚度约200nm,片状方向的等效尺寸在1～5μm之间.与固相法相比,BSA作为吸附剂获得的Na_xCo_2O_4片状晶体的厚度明显减小.

A new method of protein adsorption was investigated for the preparation of nanosized flake NaxCo2O4 compounds. The effects of BSA on the formation of the NaxCo2O4 compounds were investigated. The results show that the average particle size of colloidal precursor can be clearly decreased with the increasing of BSA concentration to 1.5-2.5mg/mL. The formation of γ-Na0.71Co0.96O2 crystalline phase is inhibited with the increasing of BSA concentration. The crystalline phase composition and morphology of calcined precursor are influenced by BSA obviously. After calcined at 800℃, ultra-thin flake γ-Na0.71Co0.96O2 crystals are obtained with about 200 nm in thickness and about 1-5μm in width along the plane direction. Compared with solid state reaction, the thickness of flake NaxCo2O4 crystals obtained by this new method is dramatically decreased.